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16 

New York AGRICULTURAL EXPERIMENT STATION. 611 
class. Although self-pollination is thus insured efficient fertiliza- 
tion does not always follow, and consequently in some varieties it 
does not result in the production of fruit. Such grapes are able to 
set fruit only when supplied with outside pollen. It is, therefore, 
probable that with grapes of this class, e. g., Salem and Brighton, 
the effect of constant spraying throughout the blossoming period | 
would give more marked results than with the variety noted in this 
experiment. 
Effect on fruits.— The most marked and permanent influence 
of the spray was seen in the character of the fruit. 
The clusters from the treated vine had very many abortive berries 
either with no seeds at all or with only mere rudiments of seeds. 
A. few clusters were nearly or quite perfect. These may have blos- 
somed after the spray had ‘been discontinued. All other clusters 
had many abortive fruits and showed every gradation of loss up to 
80 or 90 per cent. No cluster was seen in which all the 
berries were abortive. 
With the check vine perfect clusters were numerous, and abor- 
tive berries were comparatively few. 
The whole loss of fruit on the sprayed vine can not be computed 
by comparing the amount of perfect with abortive fruit, because 
some blossoms must have failed to form even abortive fruit, and 
some of the abortive fruits dropped before the grapes were 
gathered. It should be ‘borne in mind, therefore, that the total 
loss of fruit from the spraying is not represented in the following 
figures. A comparison of the fruit of the two vines shows the fol- 
lowing results: 
1. Counting all berries, whether perfect or abortive, the aver- 
age weight of a berry from the sprayed vine was 8.5 grains, and 
the average weight of a berry from the check vine was 17.5 grains, 
showing a difference of 106 per cent. 
2. The amount of abortive berries was compared with the per- 
fect berries of each vine, and 60 per cent of the fruit from the 
sprayed vine was abortive, while but 21 per cent of the fruit from 
the check vine was abortive. 
The similarity of effect in the two experiments encourages us to 
look for interesting results along these lines of investigation, but 
it is as yet too early to draw any conclusions. 
